Question

ПОМОГИТЕ 60 БАЛОВ ДАЮ

Answer 1

Ответ:

1. AC=8 cm

BD=6 cm

2. P=20 cm

3. ∠M=∠P=75°, ∠N=∠Q=105°

4. OK=2.5 cm

5. ∠RKS=30°

6. ∠ACD=35°

7. ∠OMN=55°

8. ∠BAD=∠BCD=70°

∠B=∠D=110°

9. P=34 cm

Объяснение:

1. AC=2AO=2*4=8 cm, BD=2BO=2*3=6 cm

2. P=2(AB+AD)=2(4+6)=20 cm

3. ∠M=∠P=75°, ∠N=∠Q=180-75=105°

4. OK=1/2*AD, AD=20/4=5 cm, OK=1/2*5=2.5 cm

5. sin∠RKS=5/10=0.5

∠RKS=30°

6. ∠ACD=(180-11)/2=35°

7. ∠OMN=∠LOM/2=∠KON/2=110/2=55°

8. ∠CAD=∠BCA=30°

∠BAD=∠BCD=∠BCA+∠ACD=30°+40°=70°

∠B=∠D=180-70=110°

9. P=2(AB+BC)=2(BK+BK+KC)=2(6*6+5)=34 cm